Lycoming TEO-540-C1A Maintenance Manual page 252

G. Remove the rocker box cover (Figure 18) and gasket. Discard the gasket.
H. Remove the nuts and lock washers from the rocker shaft covers. Discard the lock washers.
I. Remove the rocker shaft covers, and rocker shaft cover gaskets. Discard the gaskets.
J. Turn the crankshaft to put the piston at TDC of the compression stroke of the cylinder to be
removed. (With the piston in this position, both intake and exhaust valves are closed and the
piston is extended away from the crankcase to prevent damage when the cylinder is
removed.).
NOTICE: Do not remove valve rocker shafts until the cylinder is removed from the engine.
K. Push the valve rocker shafts (Figure 18) outward and remove the rocker assemblies and
bushings.
L. Remove the push rods and the valve stem caps from the intake and exhaust valves.
M. Using the Shroud Tube Wrench (ST-142), turn each shroud tube 90º in either direction to
release the tube from the spring.
N. Remove the shroud tubes by first releasing them from the seal seats in the cylinder head and
withdrawing the tubes.
O. Remove the seals from the ends of the shroud tubes. Discard the seals.
P. Remove the seals from the crankcase. Discard the seals.
Q. Remove the valve stem keys, valve spring seats, and valve springs.
CAUTION
R. Remove the cylinder base hold-down
nuts (Figure 18).
S. Remove the cylinder.
T. Remove the cylinder base oil ring from
the cylinder (Figure 19) and (as an
option) keep it to use as support for the
connecting rods after the pistons are
removed.
U. Remove the valve rocker shaft (Figure
18) from the engine cylinder
CAUTION
NOTICE: Examine the connecting rod bushing for damage, wear and correct installation every
time a cylinder is removed.
72-30
Page 222
AS THE CYLINDER IS SEPARATED FROM THE CRANKCASE, CATCH
AND HOLD THE PISTON TO PREVENT IT FROM FALLING AGAINST
THE CRANKCASE AND BEING DAMAGED.
IF A CYLINDER IS NOT TO BE IMMEDIATELY INSTALLED ON THE
CRANKCASE, INSTALL TORQUE HOLD-DOWN PLATES (ST-222) TO
MAINTAIN THE PRE-LOAD ON THE MAIN BEARINGS.
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Figure 19
Cylinder Base Oil Ring and Cylinder Fins
© 2018 Avco Corporation. All Rights Reserved
November 2018